I would second that the tourist days are crazy but an experience you cant miss. You will just have to live through it to understand completely. I rented from Rent4Ring. Great guys and the cars are set up nicely. I would suggest you pick a day when the track is open for 4 or more hours. You will never get enough driving in one hour and you will have to be lucky to get much driving in 2.5 hrs. Will there be accidents or is it possible they close the track? Yes. Keep in mind there is an accident every 30 minutes on average. I saw 3 accidents on my very first lap. Despite all this is was an amazing time! Everyone should do this at least once!